报告题目:From biomass to tailored energy carriers via selective catalysis in aqueous phase
发布时间:2012-09-25 12:55:24      供稿部门:科技处

报告时间:2012年10月9日(星期二)上午 9:00

报告地点:能源楼会议中心

报告人:Johannes A. Lercher

Department of Chemistry, TU München, Germany

Inst. for Integrated Catalysis, Pacific Northwest National Laboratory, USA

报告人简介:

Johannes A. Lercher是国际催化领域著名的科学家,奥地利科学院外籍院士,欧洲科学院院士,国际分子筛协会主席,德国催化协会副主席,Journal of Catalysis主编,北美催化学会Burwell 讲师。从1998年起任德国慕尼黑工业大学化工技术教授,并从2012年起兼任太平洋西北国家实验室综合催化研究室主任。

Lercher教授主要致力于重要工业反应的催化基础研究,包括催化剂和催化过程的原位表征、动力学分析和多功能先进催化材料的设计和合成。涉及领域包括氧化物和分子筛材料的吸附和催化、烃类分子的活化及功能化、重油加氢、生物质转化及碳的捕获和利用等,发表论文430余篇。

报告摘要:

Proteinaceous biomass as well as lignocellulose are promising potential raw materials for kerosene and diesel. The lecture describes strategies to catalytically produce such fuels via low temperature cascade processes. At least two different catalytic functions, i.e., acid and metal functions, are needed to convert the biogenic oligomers to fuel components. Simultaneously, bifunctionality, i.e., two sites acting simultaneously on the bond to be transformed, is frequently needed to provide the low temperature activity required. Three steps are discussed, the hydrogenolytic deconstruction of lignin fragments and fatty acids, the hydrodeoxygenation and decarbonylation/decarboxylation and the hydroalkylation to build up larger molecules. Overall the chemistry is characterized by several parallel and partly redundant pathways requiring the knowledge of the elementary steps to be able to control reaction pathways

Hydrolysis and hydrogenolysis can be used to cleave ether bonds in lignin fragments, the latter being not structure sensitive unlike C-C bond hydrogenolysis. For both reaction pathways complete conversions can be achieved. The selective aqueous phase removal also follows two potential routes, the hydrodeoxygenation and the dehydrogenation followed by decarbonylation/decarboxylation. The formed route proceeds only with dual functional catalysts, in which the metal function catalyzes (de)hydrogenation, while the acid function is responsible for dehydration and alkylation reactions. Acid sites in the confines of zeolites can finally be used to form C-C bonds to adjust so the size of the molecules. The lecture will discuss, how the detailed knowledge of the elementary reaction steps and the surface chemistry of the catalyst components in water allow designing suitable stable catalysts.

报告联系人:科技处 杨绿娟(9175)

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